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System.Data.SqlClient.SqlException (0x80131904): 在與 SQL Server 建立連接時(shi)出現與(yu)網絡相關的(de)或特(te)定(ding)於(yu)實例(li)的錯(cuo)誤(wu)。未(wei)找到或(huo)無(wu)法訪問(wen)服務(wu)器(qi)。請驗證(zheng)實例名稱是否(fou)正確並且 SQL Server 已配(pei)置為允(yun)許(xu)遠(yuan)程(cheng)連(lian)接。 (provider: Named Pipes Provider, error: 40 - 無法打(da)開(kai)到 SQL Server 的連接(jie)) ---> System.ComponentModel.Win32Exception (0x80004005): 找(zhao)不到(dao)網絡路(lu)徑。 在 System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, UInt32 waitForMultipleObjectsTimeout, Boolean allowCreate, Boolean onlyOneCheckConnection, DbConnectionOptions userOptions, DbConnectionInternal& connection) 在 System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, TaskCompletionSource`1 retry, DbConnectionOptions userOptions, DbConnectionInternal& connection) 在 System.Data.ProviderBase.DbConnectionFactory.TryGetConnection(DbConnection owningConnection, TaskCompletionSource`1 retry, DbConnectionOptions userOptions, DbConnectionInternal oldConnection, DbConnectionInternal& connection) 在 System.Data.ProviderBase.DbConnectionInternal.TryOpenConnectionInternal(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource`1 retry, DbConnectionOptions userOptions) 在 System.Data.SqlClient.SqlConnection.TryOpenInner(TaskCompletionSource`1 retry) 在 System.Data.SqlClient.SqlConnection.TryOpen(TaskCompletionSource`1 retry) 在 System.Data.SqlClient.SqlConnection.Open() 在 DBBase.clsSQL.DataTable(SqlCommand cmd) 在 dataCenter.clsTree.getTreeByID(Int32 trID) 在 Magic.One.NoPageJump404() ClientConnectionId:00000000-0000-0000-0000-000000000000 Error Number:53,State:0,Class:20